Ali,
If you record the initial state of the checkboxes in a bitfield or other
datastructure in the session and then generate another bitfield of the
checkbox states from the request to the servlet, you can tell exactly what
checkboxes have been changed.
Regards,
Richard
At 11:55 AM 12/14/2001 -0800, you wrote:
>Thanks for your reply. Still need more help.
>
>Actually this a checkbox issue. I my case i believe
>your suggestions couldn't help me
>(req.getParameterNames(). Also assign default value)
>
>Let's explain more:
>On client: I have a JSP page like spread sheet(grid).
>some of the columns may be checkboxs. As you know
>checkbox will not pass a value to webserver when is
>un-checked. If any column changed, it's name will
>concatenated by 1. (field.name= "1"+field.name).
>
>On server: The servlet will only request for
>changed-columns and update database.
>request.getParameter("1"+col_name);
>
>This logic works good for all other tags except
>checkboxs. Because cannot realize the
>1- checkbox is never changed.
>2- checkbox is changed to un-check.
>Servlet must ignore the first case but update the
>database for the second case.
>
>Thanks...Ali
>--- Mark Galbreath <[EMAIL PROTECTED]> wrote:
> > Or assign the parameter a default value.
> >
> > Mark
> >
> > -----Original Message-----
> > From: Jeremy W. Redmond
> > Sent: Friday, December 14, 2001 12:31 PM
> >
> > see if it is in the enumeration
> > req.getParameterNames().
> >
> > -----Original Message-----
> >
> > value=request.getParameter("param_name");
> >
> > The above statement in called page will return null
> > in
> > two cases:
> >
> > 1-when the "param_name" is passed with no value
> > 2-when the "param_name" didn't pass at all.
> >
> > How can I differentiate these two. I mean I need to
> > somehow know whether
> > Parameter did not pass or passed with no value.
> >
> >
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